A friend of mine, a few years back, actually drove to hospital after a fall. He collapsed as soon as he got there and was in a coma for two weeks, but recovered pretty much intact. Mild epilepsy is now the only real symptom. So it can go from no obvious problem, to life threatening, to fears of brain damage to OK again.

That's more positive isn't it, in that they induced it while carrying out the surgery? It kind of reminds me of Senna's death. I remember seeing on ceefax he was airlifted to hospital but then it accelerated quickly and the next thing he was dead.